Method and device for performing combined treatment on livestock and poultry excrement, straws and sewage

Abstract

The invention relates to a method for performing combined treatment on livestock and poultry excrement, straws and sewage. The method mainly comprises two processes of anaerobic fermentation and biological contact oxidation and comprises the main steps of: 1) mixing the crushed straws, excrement and sewage and performing anaerobic fermentation treatment; 2) removing suspended matters from methane liquid generated by the anaerobic fermentation treatment, homogenizing water quality, removing oil, performing biological contact oxidation treatment to reduce chemical oxygen demand (COD) and ammonia nitrogen, precipitating and draining water for agricultural irrigation; and 3) dehydrating and desulfurizing methane generated by the anaerobic fermentation treatment to serve as energy and composting methane slag to prepare into organic fertilizer. The invention also discloses a device for implementing the method. The device can treat the livestock and poultry excrement, the straws and the sewage, can also generate methane, realizes resource utilization of wastes and has the characteristics of simple and intensive process, higher utilization ratio of the resources and good operation effect.

Description

technical field [0001] The invention belongs to the field of environmental pollution control, and in particular relates to a method for joint treatment of livestock manure, straw and sewage. [0002] The invention also relates to a device for implementing the above method. Background technique [0003] With the development of agricultural production and the improvement of rural life, especially the rapid development of large-scale livestock and poultry farming in rural areas, livestock and poultry manure and domestic sewage have become the main sources of domestic pollution in rural areas, and are also an important cause of rural water environment pollution. At present, my country's livestock and poultry breeding industry produces about 3 billion tons of manure every year. It is estimated that by 2015, the manure output of large-scale livestock and poultry farms in my country will reach 3.25 billion tons, which has become an important factor hindering the sustainable and sta...

AI Technical Summary

Problems solved by technology

However, there are few researches on the combined treatment of livestock and poultry manure and domestic sewage. How to efficiently utilize livestock and poultry manure as a resource while effectively removing pollutants such as organic matter and ammonia nitrogen in domestic sewage is the key to the present invention

[0005] In recent years, high-concentration anaerobic fermentation technology has been increasingly used in the treatment of urban waste and rural domestic waste, but the biogas slurry and biogas residue produced after fermentation are often discharged directly, causing secondary pollution

However, due to the shortage of funds and energy sources, rural domestic sewage is generally only discharged directly after anaerobic biological treatment, and the effluent is difficult to meet the standard.

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